How Can I Conditionally Apply LINQ Where Clauses for Efficient Filtering?

Conditional Application of Linq Operators

In a logging viewer application, the user can filter log entries based on criteria such as user and severity. To implement these filters using Linq, we can conditionally apply where-clauses.

Solution:

To conditionally add where-clauses, we can use the following approach:

var logs = from log in context.Logs
           select log;

if (filterBySeverity)
    logs = logs.Where(p => p.Severity == severity);

if (filterByUser)
    logs = logs.Where(p => p.User == user);

This solution allows us to build the Expression tree dynamically, resulting in a SQL query that includes only the necessary filters. By doing this, we ensure that the SQL created is optimized for the specific filtering criteria, avoiding unnecessary operations.

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